Hybrid MU-MIMO spatial mapping using both explicit sounding and crosstalk tracking in a wireless local area network
地域：
CA
CA San Jose
摘要
Systems and methods for a wireless station supporting wireless communications with an associated wireless access point (WAP) on a wireless local area network (WLAN) where the wireless station can include hardware processing circuitry to perform hybrid spatial mapping feedback operations for multi-user (MU) multiple-input multiple-output (MIMO) downlinks from the WAP to a group of associated stations. An exemplary implementation includes a channel estimation circuit to determine a communication channel responsive to an explicit sounding from the WAP, and to transmit channel sounding feedback to the WAP indicating the determined communication channel; and a crosstalk tracking circuit to determine an amount of crosstalk from portions of a downlink MU-MIMO communication packet targeted for other stations in the group of associated stations, and to transmit crosstalk feedback to the WAP as to the determined amount of crosstalk.
說明書
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The precoding matrices are determined to meet condition (2). However, that calculation is based on a snapshot in time. The channel information is only really known when the channel is sounded. Any drift in the channel after that is not captured in the precoding matrices as calculated. These changes in channel will ultimately lead to a loss of the orthogonality condition (2) and the emergence of interference within the MU transmission. We will illustrate the effect, and then discuss ways of countering these changes in channel.
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